An object becomes positively charged when it

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

In one or two grammatically correct sentences, write a definition for the term molecule geometry